MnOx–CeO2/Activated Carbon Honeycomb Catalyst for Selective Catalytic Reduction of NO with NH3 at Low Temperatures

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State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, PR China
*Tel: +86 21 64252924. Fax: +86 21 64252914. E-mail: [email protected]
Cite this: Ind. Eng. Chem. Res. 2012, 51, 36, 11667–11673
Publication Date (Web):August 24, 2012
https://doi.org/10.1021/ie300555f
Copyright © 2012 American Chemical Society
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Abstract

Activated carbon honeycomb supported manganese and cerium oxides (MnOx–CeO2/ACH) catalysts were investigated for selective catalytic reduction (SCR) of NO at low temperatures of 80–200 °C. Compared with ACH supported manganese oxide catalyst (MnOx/ACH), MnOx–CeO2/ACH catalysts show much higher SCR activity and higher selectivity to N2. NO conversion can be improved by the addition of CeO2 from less than 50% to 100% at 80–160 °C. The N2 selectivity of higher than 99.8% is obtained over the Ce(1)Mn/ACH catalyst at 80–200 °C. Results indicate that the addition of CeO2 improves the distribution of MnOx and enhances the oxidation of NO to NO2, producing more absorbed NO3 on the catalyst surface, which is then reduced into N2 by NH3. These behaviors account for the promoting effect of CeO2 on the SCR activity.

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